Horizontal Collaboration is the first English-language narrative that focuses solely on Paris' expansive sexual life. Divided into 10 chapters, this exotic book features the Erotic Liberation following the Armistice, Flapperism in the Jazz-Age Era, Montmartre Entertainments, Legal Brothels and Prostitution, Sex Tourism, Gay Culture, Erotomania, Wartime Collaboration during the German Occupation, and Postwar Retribution against Vichy period collaborators. It is the follow-up to Gordon's highly-praised book, Voluptuous Panic (Feral House, 2008).